Intel® Fortran Compiler Classic and Intel® Fortran Compiler Developer Guide and Reference

ID 767251
Date 11/07/2023
Public

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Document Table of Contents

Intrinsic Functions for Floating-Point Inquiry and Control

The following table lists intrinsic functions for floating-point inquiry and control.

Certain functions (EXPONENT, FRACTION, NEAREST, RRSPACING, SCALE, SET_EXPONENT, and SPACING) return values related to components of the model set of real numbers. For a description of this model, see the Model for Real Data.

Name

Description

DIGITS

Returns number of significant digits for data of the same type as the argument.

EPSILON

Returns the smallest positive number that when added to one produces a number greater than one for data of the same type as the argument.

EXPONENT

Returns the exponent part of the representation of x.

FRACTION

Returns the fractional part of the representation of the argument.

HUGE

Returns largest number that can be represented by data of type the argument.

MAXEXPONENT

Returns the largest positive decimal exponent for data of the same type as the argument.

MINEXPONENT

Returns the largest negative decimal exponent for data of the same type as the argument.

NEAREST

Returns the nearest different machine representable number to the first argument in the direction of the sign of the second argument.

PRECISION

Returns the number of significant digits for data of the same type as the argument.

RADIX

Returns the base for data of the same type as the argument.

RANGE

Returns the decimal exponent range for data of the same type as the argument.

RRSPACING

Returns the reciprocal of the relative spacing of numbers near the argument.

SCALE

Multiplies the first argument by 2 raised to the power of the second argument.

SET_EXPONENT

Returns a number whose fractional part is the first argument and whose exponential part is the second argument.

SPACING

Returns the absolute spacing of numbers near the argument.

TINY

Returns smallest positive number that can be represented by data of type of the argument.

The portability routines GETCONTROLFPQQ, GETSTATUSFPQQ, LCWRQQ, SCWRQQ, SETCONTROLFPQQ, and SSWRQQ also supply this functionality.